/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.phoenix.schema.metrics;

/**
 * Factory class for creating {@link MetricsMetadataSource} instances
 */
public class MetricsMetadataSourceFactory {
    private static final MetricsMetadataSourceFactory INSTANCE = new MetricsMetadataSourceFactory();

    private volatile MetricsMetadataSource metricsMetadataSource;

    private MetricsMetadataSourceFactory() {}

    public static MetricsMetadataSourceFactory getInstance() {
        return INSTANCE;
    }

    public static synchronized MetricsMetadataSource getMetadataMetricsSource() {
        if (INSTANCE.metricsMetadataSource == null) {
            INSTANCE.metricsMetadataSource = new MetricsMetadataSourceImpl();
        }
        return INSTANCE.metricsMetadataSource;
    }

}
